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Finding the Fourth Proportional to 543.51, 815.37 and 219.11

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Solution

The fourth proportional to 543.51, 815.37 and 219.11 is: 328.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.51 : 815.37 = 219.11 : x
  2. Step 2: Convert to fraction form
    543.51/815.37 = 219.11/x
  3. Step 3: Cross multiply
    543.51x = 815.37 × 219.11
  4. Step 4: Simplify right side
    543.51x = 178,650.82
  5. Step 5: Solve for x
    x = 178,650.82/543.51
  6. Step 6: Final answer
    x = 328.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.